Dozens of padlock-trees along the Moscow River.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

Former headquarters of the KGB.

Monument to a suicide protesting the Soviet invasion.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A fountain standing as a testament to a doomed alliance.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

A daily replay of the experiment that proved the rotation of the Earth.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Where Venice's gondolas go for a tune-up.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.